Pulverizing-machine



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3 Sheets-Sheet 1.

(No Model.) U.A GUM'MINGS. PULVERIZING MACHINE.

No. 478,253. Patented 'July 5, 1892,

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ns :annum-mno., wAsmNG'fuN o c (No Model.) 3 Sheets-Sheet 2.

U. G'UMMINGS. l PULVBRIZING MACHINE.

No. 478,253. r y Patented July '5, 1892.

(No Model.) n 3 vSheets--She't 3. U. CUMMINGS.

PULVBRZING MACHINE- No. 478,253. Patented July 5, 1892.

UNITED STATES PATENT v(DE-Eroli.

URIAH CUMMINGS, OF NEW HAVEN, CONNECTICUT.

PULVERIZING-MACHINE.

SPECIFICATION forming part f Letters Patent No. 478,253, dated July 5, 1892.

Application tiled November 27, 1391. Serial No. 413,209. (No model.)

To @ZZ whom it may concern:

Be itknownthat I, URIAH CUMMINGS, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented new and useful Improvements in Pulverizing-Machines, of which the following is a specificationl This invention relates to the class'of machines which are employed for pulverizing or reducing cement, ores, and other hard substances.

My invention has forits objects to construct a compact and durable pulverizing-rnachine of large capacity; to so organize the machine that the parts which are subjected to wear can be readily removed and replaced when necessary, and finally to provide the feedhopper of the machine with simple means for regulating and cutting off the flow of the material to the pulverizing devices.

In the accompanying drawings, consisting of three sheets, Figure 1 is aside elevation of my improved pulverizer. Fig. 2 is a vertical cross-section thereof in line w av, Fig. 1. Fig. 3 is a longitudinal sectional elevation of the machine, a portion of the driving-shaft of one of the rotary grinding-disks and the driving-pulley and bearings of said shaft being omitted. Fig. 4 is a face view of one of the rotating grinding-disks on an enlarged scale. Fig. 5 is an enlarged rear view of one of the stationary grinding-disks. Fig. 6 is a face view of said stationary disk. Fig. 7 is an end view on an enlarged scale of one of the rings whereby the stationary grinding-disks are clamped against the casing of the machine. Fig. 8 is a side elevation of saidring.

Like letters of reference refer to like parts Ain the several gures.

of the casing by screw-bolts m. is formed with an internal annular shoulder g in bearings F, secured to the` beams A', and each shaft is provided with a driving-pulley F. Each stationary grinding-disk is formed with a central opening or eye d and has its face provided with radial grinding ribs or teeth or any other suitable dress. The casing A is provided in opposite ends with openings g, which coincide -with the eyes of the stationary grinding-disks.

h h are inclined deiiecting-surfaces, which slope from a transverse ridge h in the middle of the case to the lower edges of the openings g, so as to direct the descending material laterally in opposite directions to and through the eyes of the stationary grindingdisks. Each of these'stationary disks is provided on its rear side near its lower edge with an arc-shaped or semicircular rib or tenon o', which lits -into a corresponding groove i', formed in the adjacent face of the casing. This rib z'proj ects downwardly and the groove t" is undercut, as shown in Fig. 3, so as to prevent withdrawal of the rib from the groove, except by raising the disk sufficiently to allow the rib to clear the lower undercut edge of the groove.Y The upper portion of the stationary grinding-disk is clamped against the end of the casing A by a ring k, which is provided at its rear or inner edge with lugs la', which bear against lugs or ears Z, projecting radially from the rim of the stationary disk at its top and sides. This clamping-ring surrounds the rotary grinding-disk at a'suitable distance therefrom, and is held against the lugs of the stationary disk by a curb M, inclosing the pair of grinding-disks and secured to the end The curb M m', which bears against the outer edge of the clampingring lc, so that upon tightening the bolts of the curb the lugs of the ring are forced inwardly against the lugs of the stationary grinding-disk, causing the'ring to clamp the disk tightly against the end of the casing. This construction forms a very simple fastening, which dispenses with the use of bolts or similar fastenings and permits the stationary disk to be readily securedin place. The ring lo also serves as a wearing-surface, which receives the impact 0f the pulverized material, which is discharged from the periphery of the grinding-disks. This ring and IDO the stationary grinding-disk are preferably formed of chilled iron. When the rin gis worn ont, it is readily replaced by a new ring upon removing the curb M. In order to enable the ring to be removed and replaced without disturbing the shaft, the ring` is split, as shown in Fig. S, so thatit can be sprung over the shaft. The curbs M are provided with stuffin g-boxes for the passage ofthe drivin g-shafts.

Each rotary grinding-disk is provided' with a removable faceplate N, made of chilled iron and having a suitable dress or grinding-surface. The face-plate is secured to the face of the rotary disk by boltsor other fastenings, so that it can be readily removed when it becomes unserviceable from excessive wear, thereby avoiding the necessity of replacing theentire gri ndingdisk. The grinding-faces of the stationary and rotary disks approach eachother from theeye of the stationary disk to the peripheriesof the disks,.at which latter point they are arranged so closely together that the pulverized material is reduced to the desired degree of finencss when` it is discharged from the peripheries of the disks. Eachshaft is preferably provided at its outer end with an adjusting device N by which the rotary disk can be adjusted toward and from the stationary disk.

The casing A is provided with` an inclined or hopper-shaped bottom O, which receives two pairs of grinding-disks is sho-wn; but, if

the pulverized material and from which the latter is conducted to a suitable receptacle by a spout O', the casi-ng being provided below the lower edge of the stationary disk with slots P, through which the material passes from the curb intothe receiving-hopper.

q` q are pivoted gates or valvesarranged in the throat of the casing, and whereby the flow of the material to the grinding-disks may be regulated or cut off. These feed-gatesare secured upon transverse rock-shafts r r, journaled in the sides of the casing and provided with armsr for turning the shafts.

S- isa hand-lever formed at its inner end with a cross-head s, which is pivoted at its center to the outer side of the casing A. The outer ends of the arms o" are connected with opposite ends of the cross-head s by rods or links s. Upon swinging the hand-lever in one or the other direction its cross-head causes the links s to move the arms of the rock-shafts fr" inwardly or outwardly simultaneously, thereby swinging the depending feed-gates toward or from each other and restricting or enlarging the passage in thethroat of the casing. The feed may thus be regulated as desired, or it maybe entirely shut off by swinging the feed-gates against each oth er, as shown by dotted lines in Fig. l.

The material supplied to the feed-hopper descends in the throat of the casing and is directed by the inclined surfaces 7L between the faces of the grindingdisks by which it is crushed and ground. As the two rotating disks are mounted upon the inner ends of two l disks, which eyes are also unobstructed, so as l to permit the material to enter freely. l weight of the material in the throat and feedy hopper presses directly upon the material in the eyes 'of the disks and insures a constant and uniform feed.

The

The pulverized material is discharged at the periphery of the disks, a portion thereof falling directly into the receiving-hopper O, while the 'remainder is thrown against the surrounding ring 7c, from l which it passes into the curb and thence into the receiving-hopper through the slots-P.` As the rotary disks run in close proximity to the stationary disks noneof the material can escape until it has been reduced to the desired degree of fineness. The material is thus pulverized to a uniform degree of lineness by a single passage through the machine.

My :improved pulverizer is very simple in 4 construction, has a very large capacity, and i is especially desirable for pulverizing cement, phosphates, ores, and other' hard substances.

In the drawings a double` machine having desired, a single pair of disks may be employed.

I claim as my inventionl. The combination, with the stationary case provided in its upper portion with a vertical throat or passage and in its end withan opening communicating with said throat,.of 1 a stationary grinding disk or ring secu-red to y the case around said opening, a rotary grindingdisk facing the stationary grinding-disk,

a curblor casing inclosing said disks, and a tremovable wear-ring surrounding the disks and arranged on the inner side of the curb for receiving the impact of the pulverized disk is removably held in place on the case,

substantially as set forth.

s. The combination, with the case having a groove in its end, of a removable grinding` disk applied to the end of said ease and pror vided on its rear side with a ribor tenon entering said groove and at its marginal edge with lugs, a curb lnclosing said disk and secured tothe case, and a clamping-ring inter posed between said curb and the lugs` of the grinding-disk, substantially as set forth.

4. The combination, with the casing con- IIO IZO

structed with circular openings vin its sides, a inner ends of said shafts, and curbs inclosing 1o central feed-throat commnnicatingfreelywith the grinding-disks, substantially as set forth.' said openings, a transverse saddle having its1 Witness my hand this 23d day of Noveminclined sides extending to the lower edges of ber, 1891.

said circular openings, stationary grindingdisks surrounding said openings, and a dis- URIAH CU-MMINGS charge-passage underneath said saddle, of Witnesses:

separate shafts arranged on opposite sides of FRED C. EARLE,

the case, rotary grinding-disks secured to the JOHN E. EARLE. 

